Pete Oxford / Upside down Jellyfish (Cassiopeia sp) Jardines de la Reina National Park, Cuba, Caribbean

Ben Hall / 2020VISION / Close-up of the tentacles of a Sundew (Drosera rotundifolia), with secretions of mucilage, Peak District NP, August 2011. 2020VISION Exhibition.

Alex Mustard / 2020VISION / Leach's spider crab (Inachus phalangium) sheltering from the current beneath tentacles of Snakelocks anemone (Anemonia viridis) Selsey, West Sussex, UK, May

Georgette Douwma / Bubble Tip Anemone (Entacmaea quadricolor). The tentacles are usually a dull brown, but this anemone is partially bleached and has lost most of the endosymbiotic zooxanthellae. Raja Ampat, West Papua,...

Juergen Freund / Wonderpus (Wunderpus photogenicus) Indo-pacific.

Juergen Freund / True clownfish / Clown anemonefish (Amphiprion percula) amongst tentacles of anemone on reef, West New Britain, Papua New Guinea.

Juergen Freund / Blue-ringed octopus (Hapalochlaena lunulata) swimming through water, Batangas, Philippines

Juergen Freund / Orange cup coral (Tubastrea faulkneri) with polyps open, Batangas, Philippines.

Juergen Freund / Orange cup coral (Tubastrea faulkneri) detail of mouth and tentacles, Batangas, Philippines.

Juergen Freund / Sea apple (Pseudocolochirus violaceus) with tentacles exposed, feeding, Komodo NP, Indonesia, Indo-pacific.

Juergen Freund / Details of mouth of an anemone, Kimbe Bay, West New Britain, Papua New Guinea.

Juergen Freund / Pink anemonefish (Amphiprion perideraion) hiding amongst the tentacles of its closed anemone host, Kimbe Bay, West New Britain, Papua New Guinea.